In a bowl, combine all-purpose flour, glutinous rice flour, sugar, baking powder, and salt. Using a whisk, mix until combined.
In a separate bowl, add milk and egg. Mix until homogenous.
Pour the milk and egg mixture into the flour mixture. Using a spoon or whisk, gently mix. Be careful not to overmix to avoid a thick batter.
Melt 1 tablespoon of butter in the microwave or stove top. Add melted butter and vanilla extract into the batter. Mix until combined.
Heat a non-stick pan over medium heat. Add the remaining tablespoon of butter. Once the butter has melted, scoop 1/4 cup of the batter and pour it into the pan. Cook for 2 to 3 minutes or until bubbles form on the surface and the edges are golden brown. Flip then cook for another 2 to 3 minutes. Repeat for the rest of the batter.